Ducati's World Superbike star Nicolo Bulega is making his MotoGP debut in Portimão in relief of the injured Marc Marquez - and, even beyond him replacing the champion, it's more significant than your usual stand-in call-up.

But does Bulega, who will be part of Ducati's MotoGP test team next year, have a real shot at a MotoGP future? And what does he need to show this weekend and in the season finale in Valencia?

Valentin Khorounzhiy and Simon Patterson preview this Ducati debut, before naming five other riders you should watch closely over the final two rounds of the campaign - all of whom face an urgency to go into next season in better form.

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